feat(debug): implement debug server for development environment

- Added `listenDebugServer` function to handle debug requests.
- Introduced table based debug page with different functionalities.
- Updated Makefile to use `scc` for code analysis instead of `cloc`.

internal/idlewatcher/handle_http_debug.go

@@ -0,0 +1,73 @@
+//go:build !production
+
+package idlewatcher
+
+import (
+	"math/rand/v2"
+	"net/http"
+	"time"
+
+	"github.com/puzpuzpuz/xsync/v4"
+	idlewatcher "github.com/yusing/godoxy/internal/idlewatcher/types"
+	"github.com/yusing/godoxy/internal/types"
+)
+
+func DebugHandler(rw http.ResponseWriter, r *http.Request) {
+	w := &Watcher{
+		eventChs: xsync.NewMap[chan *WakeEvent, struct{}](),
+		cfg: &types.IdlewatcherConfig{
+			IdlewatcherProviderConfig: types.IdlewatcherProviderConfig{
+				Docker: &types.DockerConfig{
+					ContainerName: "test",
+				},
+			},
+		},
+	}
+
+	switch r.URL.Path {
+	case idlewatcher.LoadingPageCSSPath:
+		serveStaticContent(rw, http.StatusOK, "text/css", cssBytes)
+	case idlewatcher.LoadingPageJSPath:
+		serveStaticContent(rw, http.StatusOK, "application/javascript", jsBytes)
+	case idlewatcher.WakeEventsPath:
+		go w.handleWakeEventsSSE(rw, r)
+		ticker := time.NewTicker(1 * time.Second)
+		defer ticker.Stop()
+		events := []WakeEventType{
+			WakeEventStarting,
+			WakeEventWakingDep,
+			WakeEventDepReady,
+			WakeEventContainerWoke,
+			WakeEventWaitingReady,
+			WakeEventError,
+			WakeEventReady,
+		}
+		messages := []string{
+			"Starting",
+			"Waking dependency",
+			"Dependency ready",
+			"Container woke",
+			"Waiting for ready",
+			"Error",
+			"Ready",
+		}
+
+		for {
+			select {
+			case <-r.Context().Done():
+				return
+			case <-ticker.C:
+				idx := rand.IntN(len(events))
+				for ch := range w.eventChs.Range {
+					ch <- &WakeEvent{
+						Type:      string(events[idx]),
+						Message:   messages[idx],
+						Timestamp: time.Now(),
+					}
+				}
+			}
+		}
+	default:
+		w.writeLoadingPage(rw)
+	}
+}

internal/idlewatcher/types/paths.go

@@ -2,7 +2,8 @@ package idlewatcher
 
 const (
 	FavIconPath        = "/favicon.ico"
-	LoadingPageCSSPath = "/$godoxy/style.css"
-	LoadingPageJSPath  = "/$godoxy/loading.js"
-	WakeEventsPath     = "/$godoxy/wake-events"
+	PathPrefix         = "/$godoxy/"
+	LoadingPageCSSPath = PathPrefix + "style.css"
+	LoadingPageJSPath  = PathPrefix + "loading.js"
+	WakeEventsPath     = PathPrefix + "wake-events"
 )